Contrast SensitivityNCT01901744
Contrast Sensitivity Assessment in Pediatric Cataract Surgery With IOL Implantation
A study testing Cataract Surgery in people with Contrast Sensitivity, run by Iladevi Cataract and IOL Research Center at 1 site in India.
Trial summary
The study evaluates contrast sensitivity in older children following surgery for lamellar and posterior subcapsular cataracts. Often, pediatric surgeons tend to delay surgery in these children who present beyond the amblyogenic age group. Read more about this study
- Who is it for?
- Ages 1 year to 15 years
- Conditions the study is for
- Contrast Sensitivity
- What is being tested?
- Cataract Surgery
- Type of treatment
- Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 25 participants
- Where
- 1 siteIndia
- Study dates
- Jan 2009to Jan 2013
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 1 year to 15 years
- All sexes
- No healthy volunteers
- Child
Who may be able to join
- Children older than 4 years and lamellar and posterior subcapsular cataracts undergoing cataract surgery with IOL implantation
Who cannot join
- eyes with traumatic or subluxated cataract,
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Contrast Sensitivity Assessment in Pediatric Cataract Surgery With IOL Implantation: A Comparison of Preoperative and Early Postoperative Outcomes
The study evaluates contrast sensitivity in older children following surgery for lamellar and posterior subcapsular cataracts. Often, pediatric surgeons tend to delay surgery in these children who present beyond the amblyogenic age group. These cataracts are often compatible with reasonable visual acuity and therefore some surgeons prefer to wait for surgery, whereas others tend to operate.
The study evaluates improvement in contrast sensitivity at different spatial frequencies following cataract surgery for lamellar and posterior subcapsular cataracts in older children.
Read the detailed description
All patients undergoes temporal clear corneal incision, manual anterior continuous curvilinear capsulorhexis, bimanual irrigation/aspiration for lens removal and residual cortex, posterior capsule management based on the age of the patient either manual posterior capsulorhexis (PCCC) upto 6 years or leaving intact posterior capsule and implantation of single-piece AcrySof SN60WF (Alcon Laboratories, Forth Worth, Texas) hydrophobic acrylic IOL in-the-bag. Postoperatively, all the patients are examined first for high contrast sensitivity and then for low contrast at 1 week, 1 and 3 months respectively.
The results are analyzed for corrected distance visual acuity (CDVA) which is recorded in LogMAR units at preoperative and 1 and 3 months postoperatively. Monocular high-contrast Snellen visual assessment for distance is done with the Early Treatment Diabetic Retinopathy Study chart (Vector Vision acuity chart at 100% contrast) with Corrected distance visual acuity CDVA at 4 m under photopic condition.
Similarly at preoperative and 1 and 3 months postoperatively contrast sensitivity testing is also performed using the CSV 1000E sine wave grating test face (Vector Vision, USA) with the patient seated at a distance of 2.5 m from the chart. The test is performed after the patient is adapted to the room luminance for 5 minutes. The non viewing eye was occluded for each measurement, and the best spectacle refractive correction is placed in front of the viewing eye. Testing is being tested under two lighting conditions: photopic (85cd/m2) and mesopic (2.7cd/m2). The contrast sensitivity values are documented in log units. Sensitivity levels at each frequency range from 0.7 to 2.08 (3 cpd), 0.91 to 2.29 (6 cpd), 0.61 to 1.99 (12 cpd), and 0.17 to 1.55 (18 cpd) log units. This testing is performed with the patient wearing their refractive correction in form of spectacles.
- Conditions
- Contrast Sensitivity
- Being tested
- Cataract Surgery
- Keywords
- Contrast Sensitivity , Pediatric Cataract Surgery,
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Cataract SurgeryProcedure or surgery
| Study group | Role | What they receive |
|---|---|---|
| Patients undergoing cataract surgery | Experimental | Not described Receives: Procedure: Cataract Surgery |
What is being measured
The primary outcome is the main question the study is designed to answer.
Contrast Sensitivity at 3, 6, 12 and 18 cycles per degree under photopic and mesopic conditions pre and post cataract surgery
Preoperative and 1 and 3 months postoperatively contrast sensitivity testing would performed using the CSV 1000E sine wave grating test face (Vector Vision, USA) with the patient seated at a distance of 2.5 m from the chart. The test is performed after the patient was adapted to the room luminance for 5 minutes. The non viewing eye is occluded for each measurement, and the best spectacle refractive correction is placed in front of the viewing eye. Testing is performed at preoperative 3, 6, 12 and 18 cycles per degree, each spatial frequency being tested under two lighting conditions: photopic (85cd/m2) and mesopic (2.7cd/m2). The contrast sensitivity values are documented in log units. Sensitivity levels at each frequency range from 0.7 to 2.08 (3 cpd), 0.91 to 2.29 (6 cpd), 0.61 to 1.99 (12 cpd), and 0.17 to 1.55 (18 cpd) log units. This testing is performed with the patient wearing their refractive correction in form of spectacles.
Measured: up to 3 months postoperatively
Secondary outcomes (1)
Improvement in Best Corrected Snellen's Visual Acuity following Cataract Surgery
Corrected distance visual acuity (CDVA) which IS recorded in LogMAR units at preoperative and 1 and 3 months postoperatively. Monocular high-contrast Snellen visual assessment for distance would be done with the Early Treatment Diabetic Retinopathy Study chart (Vector Vision acuity chart at 100% contrast) with Corrected distance visual acuity CDVA at 4 m under photopic condition.
Measured: 1 and 3 months postoperatively
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted17 Jul 2013 (estimated)
- Study startJan 2009
- Primary completionJul 2011
- Study completionJan 2013
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Contrast SensitivityStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 25 participants (actual)
Sponsor and investigators
- Lead sponsor
- Iladevi Cataract and IOL Research Center
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Abhay R. Vasavada, Iladevi Cataract and IOL Research Center
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01901744
- Sponsor's protocol ID
- 12-008
- Status last verified
- Jul 2013
- First submitted
- 1 Jul 2013
- Last updated
- 17 Jul 2013
- Results posted
- No
- Data monitoring committee
- Yes
Study at a glance
From the registry record, last updated by the sponsor on 17 Jul 2013. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Contrast Sensitivity Assessment in Pediatric Cataract Surgery With IOL Implantation: A Comparison of Preoperative and Early Postoperative Outcomes
- ClinicalTrials.gov ID
- NCT01901744
- Acronym / sponsor ID
- 12-008
- Conditions
- Contrast Sensitivity
- Keywords
- Contrast Sensitivity , Pediatric Cataract Surgery,
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 25 participants (actual)
- Lead sponsor
- Iladevi Cataract and IOL Research CenterUniversity, hospital or other
- Study start
- Jan 2009
- Primary completion
- Jul 2011 (actual)
- Study completion
- Jan 2013 (actual)
- First posted
- 17 Jul 2013 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The study evaluates contrast sensitivity in older children following surgery for lamellar and posterior subcapsular cataracts. Often, pediatric surgeons tend to delay surgery in these children who present beyond the amblyogenic age group. These cataracts are often compatible with reasonable visual acuity and therefore some surgeons prefer to wait for surgery, whereas others tend to operate.
The study evaluates improvement in contrast sensitivity at different spatial frequencies following cataract surgery for lamellar and posterior subcapsular cataracts in older children.
Detailed description
All patients undergoes temporal clear corneal incision, manual anterior continuous curvilinear capsulorhexis, bimanual irrigation/aspiration for lens removal and residual cortex, posterior capsule management based on the age of the patient either manual posterior capsulorhexis (PCCC) upto 6 years or leaving intact posterior capsule and implantation of single-piece AcrySof SN60WF (Alcon Laboratories, Forth Worth, Texas) hydrophobic acrylic IOL in-the-bag. Postoperatively, all the patients are examined first for high contrast sensitivity and then for low contrast at 1 week, 1 and 3 months respectively.
The results are analyzed for corrected distance visual acuity (CDVA) which is recorded in LogMAR units at preoperative and 1 and 3 months postoperatively. Monocular high-contrast Snellen visual assessment for distance is done with the Early Treatment Diabetic Retinopathy Study chart (Vector Vision acuity chart at 100% contrast) with Corrected distance visual acuity CDVA at 4 m under photopic condition.
Similarly at preoperative and 1 and 3 months postoperatively contrast sensitivity testing is also performed using the CSV 1000E sine wave grating test face (Vector Vision, USA) with the patient seated at a distance of 2.5 m from the chart. The test is performed after the patient is adapted to the room luminance for 5 minutes. The non viewing eye was occluded for each measurement, and the best spectacle refractive correction is placed in front of the viewing eye. Testing is being tested under two lighting conditions: photopic (85cd/m2) and mesopic (2.7cd/m2). The contrast sensitivity values are documented in log units. Sensitivity levels at each frequency range from 0.7 to 2.08 (3 cpd), 0.91 to 2.29 (6 cpd), 0.61 to 1.99 (12 cpd), and 0.17 to 1.55 (18 cpd) log units. This testing is performed with the patient wearing their refractive correction in form of spectacles.
Study design
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Patients undergoing cataract surgery | Experimental | Procedure: Cataract Surgery |
Who may qualify
- Ages
- 1 year to 15 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child
Key inclusion criteria (1 listed)
- Children older than 4 years and lamellar and posterior subcapsular cataracts undergoing cataract surgery with IOL implantation
Key exclusion criteria (1 listed)
- eyes with traumatic or subluxated cataract,
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Cataract Surgery | Procedure or surgery | Patients undergoing cataract surgery |
Primary outcome
Contrast Sensitivity at 3, 6, 12 and 18 cycles per degree under photopic and mesopic conditions pre and post cataract surgery
Time frame: up to 3 months postoperatively
Preoperative and 1 and 3 months postoperatively contrast sensitivity testing would performed using the CSV 1000E sine wave grating test face (Vector Vision, USA) with the patient seated at a distance of 2.5 m from the chart. The test is performed after the patient was adapted to the room luminance for 5 minutes. The non viewing eye is occluded for each measurement, and the best spectacle refractive correction is placed in front of the viewing eye. Testing is performed at preoperative 3, 6, 12 and 18 cycles per degree, each spatial frequency being tested under two lighting conditions: photopic (85cd/m2) and mesopic (2.7cd/m2). The contrast sensitivity values are documented in log units. Sensitivity levels at each frequency range from 0.7 to 2.08 (3 cpd), 0.91 to 2.29 (6 cpd), 0.61 to 1.99 (12 cpd), and 0.17 to 1.55 (18 cpd) log units. This testing is performed with the patient wearing their refractive correction in form of spectacles.
1 secondary outcome
Improvement in Best Corrected Snellen's Visual Acuity following Cataract Surgery
Time frame: 1 and 3 months postoperatively
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 17 Jul 2013.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Cataract Surgery in people with Contrast Sensitivity, run by Iladevi Cataract and IOL Research Center at 1 site in India.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 17 Jul 2013. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in India. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Contrast Sensitivity at 3, 6, 12 and 18 cycles per degree under photopic and mesopic conditions pre and post cataract surgery (time frame: up to 3 months postoperatively). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 17 Jul 2013.